Of course these days we are all too aware of the pitfalls of using too much petrol or coal or finite sources of fuel - it's become, if you like, a very modern affliction. Which is why it is all the more surprising that the humble bicycle comes out on top when it comes to efficiency of fuel - it's more efficient even than just walking.
Fuel expended by mode of transport, KJ per KM per passenger:
I don't point this out because I think it's some great green stick we should use to beat and berate other transport users with, but to point out how much sense cycling makes when you weigh up the options.
Getting around town more efficiently, on one of the greatest inventions ever made by man? It's reason number 20 to love cycling in London!
The above graphs were created by me using data collected here.